{
ssize_t base;
struct cookie *c = f->cookie;
- switch (whence) {
- case SEEK_SET:
- base = 0;
- break;
- case SEEK_CUR:
- base = c->pos;
- break;
- case SEEK_END:
- base = c->len;
- break;
- default:
- fail:
+ if (whence>2U) {
+fail:
errno = EINVAL;
return -1;
}
+ base = (size_t [3]){0, c->pos, c->len}[whence];
if (off < -base || off > SSIZE_MAX-base) goto fail;
return c->pos = base+off;
}
{
ssize_t base;
struct cookie *c = f->cookie;
- switch (whence) {
- case SEEK_SET:
- base = 0;
- break;
- case SEEK_CUR:
- base = c->pos;
- break;
- case SEEK_END:
- base = c->len;
- break;
- default:
- fail:
+ if (whence>2U) {
+fail:
errno = EINVAL;
return -1;
}
+ base = (size_t [3]){0, c->pos, c->len}[whence];
if (off < -base || off > SSIZE_MAX/4-base) goto fail;
memset(&c->mbs, 0, sizeof c->mbs);
return c->pos = base+off;